Tim –
Thanks for your message. There is much research out there on this subject. Secondary glazing, properly fitted, will provide almost the same benefits as double glazing and there are many products that can easily be retrofitted into historic buildings successfully. Indeed, in some instances (and always subject to the local planning offices’ advice) may not need listed building consent as they are completely reversable and may even be installed by a competent DIY-er. Installing double-glazing as a form of secondary glazing is not something I’ve seen done here although “twinning” is done in some arctic areas.
The starting point is always ensure proper maintenance and draughtproofing of existing windows, which can be done for a third of the cost of retrofitting double-glazing. A poorly fitted window regardless of glazing type will always cause problems.
All the main state agencies have very comprehensive guidance on the subject.
Terry Terry Levinthal director@cockburnassociation.org.uk
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